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I've been setting up an Ubuntu server with KVM, as documented at https://help.ubuntu.com/community/KVM/Installation. Once I started virt-manager and set up my 2nd video card for pass-thru, it informed me that VT-d was not enabled. I exited virt-manager without proceeding with the Windows install, restarted, enabled VT-d in the bios, and henceforth 2 of my NTFS-formatted storage drives cannot be detected at boot time displaying the message,

"disk drive /media/storagedrive is not ready yet or not present. Continue to wait, or press S to skip mounting or M for manual recovery"

When I press M, I get to a root shell prompt, and issuing "fdisk -l" indeed shows the drives to be absent. Another storage drive, ext4-formatted, always mounts as usual. If I disable VT-d and reboot, there are no mounting problems whatsoever. So what is the problem here?

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I should have mentioned that I'm using the original Big Bang XPower motherboard. Apparently, there is an issue where the VT-d feature causes a conflict with the SATA 3 controller, and disks on the SATA 3 ports can no longer be detected. I discovered this after disconnecting the drives and moving them to different ports. Disabling VT-d re-enables the ports.

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